NEET 2022 — Physics

In half-wave rectification, if the input frequency is 60 Hz, then the output frequency would be:

As the temperature increases, the electrical resistance:

Let $T_1$ and $T_2$ be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to Bohr's model of an atom, the ratio $T_1:T_2$ is:

If a soap bubble expands, the pressure inside the bubble:

In the given nuclear reaction, the element X is:

${}_{11}^{22}\mathrm{Na}\to \mathrm{X}+e^{+}+\nu$

A copper wire of length 10 m and radius $\left(\frac{10^{-2}}{\sqrt{\pi }}\right)$ m has electrical resistance of $10\Omega$. The current density in the wire for an electric field strength of 10 V/m is:

The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is:

Plane angle and solid angle have:

Two objects of mass 10 kg and 20 kg respectively are connected to the two ends of a rigid rod of length 10 m with negligible mass. The distance of the centre of mass of the system from the 10 kg mass is:

A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball ($v$) as a function of time ($t$), is:

When light propagates through a material medium of relative permittivity ${\epsilon }_r$ and relative permeability ${\mu }_r$, the velocity of light $v$ is given by ($c$ = velocity of light in vacuum):

The angular speed of a flywheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in $rad/{\mathrm{s}}^2$ is:

Given below are two statements:

Statement I: Biot–Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element ($Id\vec{l}$) of a current-carrying conductor only.

Statement II: Biot–Savart's law is analogous to Coulomb's inverse square law of charge $q$, with the former being related to the field produced by a scalar source, $Id\vec{l}$, while the latter being produced by a vector source, $q$.

In the light of the above statements, choose the most appropriate answer from the options given below:

The dimensions $[\mathrm{M}\mathrm{L}{\mathrm{T}}^{-2}{\mathrm{A}}^{-2}]$ belong to the:

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of the screen when monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is:

A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

An electric lift with a maximum load of 2000 kg (lift + passengers) is moving up with a constant speed of $1.5\mathrm{m}{\mathrm{s}}^{-1}$. The frictional force opposing the motion is 3000 N. The minimum power delivered by the motor to the lift in watts is ($g=10\mathrm{m}{\mathrm{s}}^{-2}$):

The peak voltage of the ac source is equal to:

Two resistors of resistance $100\Omega$ and $200\Omega$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in $100\Omega$ to that in $200\Omega$ in a given time is:

A body of mass 60 g experiences a gravitational force of 3.0 N when placed at a particular point. The magnitude of the gravitational field intensity at that point is:

A light ray falls on a glass surface of refractive index $\sqrt{3}$ at an angle of $60^{\circ }$. The angle between the refracted and reflected rays would be:

In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in:

An ideal gas undergoes four different processes from the same initial state as shown in the figure below. Those processes are adiabatic, isothermal, isobaric and isochoric. The curve which represents the adiabatic process among 1, 2, 3 and 4 is:

The angle between the electric lines of force and the equipotential surface is:

The displacement–time graphs of two moving particles make angles of $30^{\circ }$ and $45^{\circ }$ with the $x$-axis as shown in the figure. The ratio of their respective velocities is:

The ratio of the distances travelled by a freely falling body in the 1st, 2nd, 3rd and 4th second is:

A shell of mass $m$ is at rest initially. It explodes into three fragments having masses in the ratio 2 : 2 : 1. If the fragments having equal mass fly off along mutually perpendicular directions with speed $v$, the speed of the third (lighter) fragment is:

A biconvex lens has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is:

The graph which shows the variation of the de Broglie wavelength ($\lambda$) of a particle and its associated momentum ($p$) is:

When two monochromatic lights of frequency $\nu$ and $\frac{\nu }{2}$ are incident on a photoelectric metal, their stopping potentials become $\frac{V_s}{2}$ and $V_s$ respectively. The threshold frequency for this metal is:

Match List-I with List-II.

Choose the correct answer from the options given below:

A square loop of side 1 m and resistance $1\Omega$ is placed in a magnetic field of 0.5 T. If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is:

Two hollow conducting spheres of radii $R_1$ and $R_2$ ($R_1\gg R_2$) have equal charges. The potential would be:

If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is:

Two pendulums of length 121 cm and 100 cm start vibrating in phase. At some instant, the two are at their mean position in the same phase. The minimum number of vibrations of the shorter pendulum after which the two are again in phase at the mean position is:

A series LCR circuit with inductance 10 H, capacitance $10\mu F$ and resistance $50\Omega$ is connected to an ac source of voltage $V=200\sin (100t)$ volt. If the resonant frequency of the LCR circuit is ${\nu }_0$ and the frequency of the ac source is $\nu$, then:

A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at $2\mathrm{rad}{\mathrm{s}}^{-1}$. If the vertical component of the earth's magnetic field at that place is $2\times 10^{-5}$ T and the electrical resistance of the coil is $12.56\Omega$, then the maximum induced current in the coil will be:

Two point charges $-q$ and $+q$ are placed at a distance $L$ apart, as shown in the figure. The magnitude of the electric field intensity at a distance $R$ ($R\gg L$) varies as:

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of the magnetic field in the inside and outside regions of the wire is:

A Wheatstone bridge is used to determine the value of an unknown resistance $X$ by adjusting the variable resistance $Y$ as shown in the figure. For the most precise measurement of $X$, the resistances $P$ and $Q$:

A capacitor of capacitance $C=900$ pF is charged fully by a 100 V battery B as shown in figure (a). Then it is disconnected from the battery and connected to another uncharged capacitor of capacitance $C=900$ pF as shown in figure (b). The electrostatic energy stored by the system (b) is:

A nucleus of mass number 189 splits into two nuclei having mass numbers 125 and 64. The ratio of the radii of the two daughter nuclei respectively is:

The volume occupied by the molecules contained in 4.5 kg of water at STP, if the intermolecular forces vanish away, is:

The truth table for the given logic circuit is:

A ball is projected with a velocity of $10\mathrm{m}{\mathrm{s}}^{-1}$ at an angle of $60^{\circ }$ with the vertical direction. Its speed at the highest point of its trajectory will be:

Two transparent media A and B are separated by a plane boundary. The speeds of light in those media are $1.5\times 10^8$ m/s and $2.0\times 10^8$ m/s, respectively. The critical angle for a ray of light for these two media is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The stretching of a spring is determined by the shear modulus of the material of the spring.

Reason (R): A coil spring of copper has more tensile strength than a steel spring of the same dimensions.

In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II.

Choose the correct answer from the options given below:

The area of a rectangular field (in ${\mathrm{m}}^2$) of length 55.3 m and breadth 25 m, after rounding off the value to the correct significant digits, is: